NAME
    popcnt - number of bit that match a given value

SYNOPSIS
    popcnt(x [,bitval])

TYPES
    x		number (real or integer)
    bitval	0 or 1

    return	number

DESCRIPTION
    Count the number of bits in abs(x) that match bitval.  The default
    bitval is 1 which counts the number of 1 bits.

    The popcnt function is equivalent to #x when x is an integer.

EXAMPLE
    > print popcnt(32767), popcnt(3/2), popcnt(pi(),0), popcnt(pi(),1)
    15 3 69 65

    > print popcnt(randombit(128), 0), popcnt(randombit(128), 1)
    61 64

LIMITS
    none

LIBRARY
    long zpopcnt(ZVALUE z, int bitval)

SEE ALSO
    none